My first job was with Pye Telecom in 1970 in the Portables Lab. I had to put 12.5kHz channel spacing into the PF1 receiver. My boss was a John McLean and his boss was, now SK, Mike Gotch (later G0IMG). At the time I did not know that Mike was interested in amateur radio. In his latter years he was keen on 10m and 6m.
The 2 unit PF1's sold in good volumes to the UK police. These were the first common UHF portables in the world. A few specials were made for chief constables and the like.
Work was very different then! These days people would not get away with what we did back then. There was very little competition and work was easy.